Hollow Backlight Unit
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Jun 19, 2014
filing date -
Mar 3, 2014
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Abandoned
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Abstract
A hollow backlight unit preserves the benefits of a conventional backlight based on a solid light guide, but has lower weight and cost. The hollow cavity of the unit has a flat reflective bottom, three reflective side surfaces, LEDs placed in a hollow edge reflector on the fourth side, and a top layer with light extracting features that covers the entire viewing area of the hollow backlight unit. The hollow backlight can be used together with an additional diffuser on the top to avoid cross-talk between the light extracting features and LCD pixels. It can also be combined with optical films like BEF/DBEF to enhance efficiency and control view angle performance.
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